Check an IPv4 address against several public blocklists

For web teams checking a launch or tracing a fault, this test provides an immediate point of reference. Check an IPv4 address against several public blocklists.

Check an IPv4 address against several public blocklists. The result highlights the live configuration and the clues that matter for diagnosis.

How to use

Enter a complete IPv4 address in the field, without a subnet mask or port number.
Run the test to query several public blocklists on your behalf.
Read the result to see whether the address appears on one or more lists, and note the clues useful for diagnosis.
If the address is listed, review each list's removal procedure before requesting a delisting.
Keep the date of the check if you need to track changes in the address reputation.

Example

An administrator receives reports that emails from a server are being rejected. They test the machine's IPv4 address to see whether it appears on a blocklist, then use the findings to guide a delisting request.

Limits and formats

The result depends on the public lists queried and can vary from one service to another.
An address missing from a list at test time may be added later, and the reverse can also happen.
The tool does not remove an address from a blocklist or contact list operators for you.
For an address range or an IPv6 address, this test is not suitable as presented.

Where processing happens

The IPv4 address you enter is sent to the YOORfree server, which queries public blocklists itself and returns the result. No file is uploaded.

Frequently asked questions

Why is my address listed when my emails seem normal?

A blocklist may flag an address after an incident, a bulk sending issue or a complaint, even if the server works well today. The result helps locate the problem, but the exact cause must be checked with the list concerned.

Can I test an IPv6 address?

The check shown is intended for IPv4 addresses. For IPv6, look for a specialized tool or query the lists that support that format directly.

Does the test send emails?

No. It queries public lists using the address you provide. It sends no messages and does not change your server's reputation.